SQL Server :: Get The Last 3 Tags That Added To The Db

I want get the last 3 tags that added to the db. My Tag table schema is:

TBL TAG:
CREATE TABLE [dbo].[tblTag](
[TagId] [int] IDENTITY(1,1) NOT NULL,
[Header] [nvarchar](200) NULL,
[IsActive] [tinyint] NULL DEFAULT ((0)),
[Ordered] [int] NOT NULL DEFAULT ((1)),
[Language] [nvarchar](5) NULL,
[DateTime] [smalldatetime] NULL,
[Official] [nvarchar](max) NULL,
[LastUpdate] [datetime] NULL,
[Locked] [tinyint] NULL,
[LastUpdateUser] [nvarchar](256) NULL,
[NumViews] [bigint] NULL,
[AllUserModified] [nvarchar](max) NULL,
CONSTRAINT [PK_tblTag] PRIMARY KEY CLUSTERED
(
[TagId] ASC
)

My TagtoMoudule table:

CREATE TABLE [dbo].[tbl_Module_Tag](
[AutoId] [int] IDENTITY(1,1) NOT NULL,
[ModuleId] [int] NOT NULL,
[ItemId] [int] NOT NULL,
[TagId] [int] NOT NULL
) ON [PRIMARY]

I want get the last 3 items in the tbl_Module_Tag but with no duplicate value, get uniq tags For exemple If the data the query "select tagid from tbl_Module_Tag order by autoid desc" return this values..........